1990 July 14: Metro Blue Line opens between downtown Los Angeles and Long Beach (later renamed the “A” Line)
1990 September 1: Metro Blue Line Long Beach Loop opens
1991 February 15: Metro Blue Line, Segment II opens between 12th/Pico Station and 7th/Flower Station in downtown Los Angeles.
1992 October 26: Once part of Metro, Metrolink begins operations
1993 January 30: Metro Red Line, Segment I opens between Union Station and 7th/Metro Station (later renamed the “B” Line)
1994 March 11: Metro holds a groundbreaking ceremony for the Metro Red Line (now “B” Line) Segment 3 at North Hollywood. Segment 3 links Hollywood/Vine Station with North Hollywood via the Cahuenga Pass.
1994 April 8: An initial groundbreaking ceremony is held for the Pasadena Blue Line (now the “A” Line) for the Union Station to Pasadena segment. A second groundbreaking ceremony is held on June 8, 2000.
1995 August 12: Metro Green Line opens between Norwalk and Redondo Beach (later renamed “C Line”)
1996 July 15: Metro Red Line Segment IIA opens between Alvarado Street to Wilshire/Western Station (later renamed Purple Line, then again later renamed the “D” Line)
2000 June 24: Metro Red Line Segment III opens between Hollywood/Vine and North Hollywood
2003 July 25: Metro Gold Line opens between downtown Los Angeles and Sierra Madre Villa Station in East Pasadena (later renamed the “L” Line)
2005 October 29: Metro Orange Line opens, a 14-mile dedicated bus rapid transit line between North Hollywood and Woodland Hills (later renamed the “G” Line)
2009 November 15: Metro Gold Line Eastside Extension opens between Los Angeles Union Station and East Los Angeles
2009 December 13: Metro Silver Line opens, a 38-mile bus rapid transit line between El Monte and Harbor Gateway / San Pedro, via downtown Los Angeles
2010 June 26: Metro breaks ground on the Gold Line Foothill Extension (now the “A” Line) Phase 2A from Sierra Madre Station in Pasadena to Azusa
2012 April 27: Metro Expo Line, Phase I opens between downtown Los Angeles and Culver City (later renamed the “E” Line)
2016 March 5: Metro Gold Line Foothill Extension opens from Sierra Madre Villa Station to Azusa Station
2016 May 20: Metro Expo Line, Phase II opens between Culver City and Santa Monica
2022 October 7: The Metro Crenshaw/LAX Line (the “K” Line) opens
2022 December 2: Metro breaks ground on early pre-construction and utility relocation activities for the East San Fernando Valley Light Rail Transit Project
2023 June 16: Metro Regional Connector opens
2025 September 19: The Metro A Line (Foothill Gold Line Extension segment) opens from Azusa station to Pomona North station
2026 October 19: Metro breaks ground on major construction for the East San Fernando Valley Light Rail Transit Project in Van Nuys, California